Jacob Tyler Roberts listed one of his hobbies as "shooting."
A chilling photo that has surfaced shows him on a gun range. In another picture, he appears to have a gun tattooed on the inside of his left arm.
One close friend told INSIDE EDITION Roberts was kicked out of the house by his mother five years ago.
Roberts, who described himself as an "adrenaline junkie" trained to be a firejumper, but was working in the meantime at a gyro sandwich shop.
The friend described Roberts as "happy go lucky."